Zigzag, straightaway, stitch sewing-machine with top feed.



J. R. MOFPATT. ZIGZAG, STRAIGHT AWAY, sTITeH' SEWING MACHINE WITH TOP FEED.

APPLICATION FILED NOVTZB, 1905.

Patented Sept. 1, 1914 7 SHEETS-SHEET 1.

IIIIIWILLIMLIIIH LlTHD. WASHINGTON. u. c.

- J. R. MDFPATT.

ZIGZAG, STRAIGHT AWAY, smcn SEWING MACHINE WITH TOP r321).

APPLICATION FILED NOV. 28, 1905. 1 109,635 Patented Sept. 1, 1914.

7 SHEETS-SHEBT 2.

W I M4 J. R. MOFFATT.

ZIGZAG, STRAIGHT AWAY, STITCH SEWING MACHINE WITH TOP FEED.

APPLICATION FILED NOV. 28, 1905.

1,109,635, Patented Sept. 1, 1914.

7 SHEETS-SHEET 3.

J. R. MOFFATT. ZIGZAG, STRAIGHT AWAY, STITCH SEWING MACHINE WITH TOP FEED.

APPLICATION FILED NOV, 28, 1905.

Patented Sept. 1, 1914 7 SHEETS-SHEET 4.

a W u J. R. MOPPATT. ZIGZAG STRAIGHT AWAY, STITCH SEWING MACHINE WITH TOP FEED. APPLICATION FILED NOV. 28, 1905.

1,109,635, Patented Sept. 1, 1914.

! SHEETS-SHEET 5.

I V 5&6,

T f' I: f 8 w I igz i Wm 5Q $9 7 1 I s 5.

:51 51 2 I IH JHH' MP I 1 26 f 'l' t 21 I 1 2 E 7 L j :35? I I lurfiwm fgww W J.- R.- M-OFPATT. ZIGZAG, STRAIGHT AWAY STITCH SEWING MACHINE. WITH TOP FEED; APPLICATION FILED H0128, 1905.

1,109,635, Patented Sept. 1, 1914.

7 SHEETS-SHEET 6.

J. R. MOFFATT. ZIGZAG, STRAIGHT AWAY, STITCH SEWING MACHINE WITH TOP FEED.

APPLICATION FILED NOV. 28, 1905.

Patented Sept. 1, 1914 JAMES R. MOFFATT, or CHICAGO, ILLINOIS, ASSIGNOB. To UNIoN sPEcIAL MACHINE v co rANY, or CHICAGO, ILLI oIs, A CORPORATION or ILLINoIs.

ToaZZ whom'it may concern:

Be it known that I, JAMES;- R. MoFFATT,

a citizen of the United States, residing at Chicago, in the county of Cook, State of Illinois, have invented certain new and useful Improvements inZigzag, Straightaway, Stitch Sewing-Machines with, Top

Feed, of which the following is a description, reference being had to the accompanying drawing, and to the letters and figures of-reference marked thereon;

The present invention relates to improvements in machines for sewing straight-away andzig zag stitches of the chain type, shown, described'and claimed in Letters Patent of the United States, granted Russel G, Wood- I Ward on the 23rd day of February, 1904:,

No. 753,187, and on the 9th day of June 1908, No. 890,582. It has been found in the use of'machines of the above type, forclosing the uppers of boots and shoes, that it is' desirable to employ a top feed" to co-act with the usual under feed, and the principal object of the present invention is to provide the machinewithf'a top feed and to'so ar-' range the operating mechanism thereof as to avoid interfering with the operating mechanism of any of the usual parts of the stitch-forming mechanism,

The invention consists of inafter described and referred to inthe appendedclaims. i The'invention is illustrated in the accom panying drawings, in which,

*Figure 1 isa rear elevation of a sewing machineembodying the invention; Fig. 2 is an end elevation of the same, drawn on a somewhat larger scale; Fig. 3 is a detail per; spective view of the stitch-forming mecha-{ nism below the cloth plate and the mechanism for operating the top and bottom feed;

Fig.4 is a transverse sectional view; ofa

portion of the machine, showing the manner in which the top feed is actuated from the loop detainer operating cam; Fig.15is a de-v tail perspective View, illustrating lmorepar f ticularly the upper and lowerfeeds' and the mechanism'for operating the same; Fig. 6 is a vertical: section of thefmachinefshowing the adjustment of the'part's wh'en arranged for zigzag sewing; Fig. 7 is a view similar to Fig. 3, showing the adjuSt-rfientof parts for the formation'of straig''ht away Specification of LettersJ-Eatent. Application filed November as, 1905. seriai No. 289,488

the matters here stitches, and Fig. 8 is-a detailperspective VIBW Of the mechanism for changing the character of the stitch.

In these drawings, A represents the base of the machine, in which rises an arm a, carrying atitshead a the usual parts ofthe machine, such as the press'er bar and the swinging needle bar carrying gate I or y'frame2. I

B represents the main shaft, which at its rear end'carriesthe belt wheel B. On this shaft is secured a pinion F, the teeth of which intermesh in those of the gear wheel F, this mechanism forming a part of and being similar} to the mechanisms described and claimed in the hereinbefore mentioned Letters Patent and applications, and being designed for the purpose of transmitting vi-. 'bratorymovement to the needle bar carrying gate in the formation of zig zag' stitches, or forholding said gate stationary during straight-away sewing.

The outer end of the shaftis provided" :with' an enlarged circular head f, forming a guide and support for a cam F, that is secured to and rotates with the gear wheel F. The cam f is of the contour clearly shown i Figs.: :6 and 7, that is, three-cornered, and

.rotates between and in working contactwith the two arms g, g, of a frame Gr, hung on a pivot stud g carriedby the" arm a, the movements of the cam being transmitted to said arms, and effecting an oscillatorymovement-of the frame. Tothe frame G isseat timesslightly eccentric to a pin j, carried by thelowerendlof a rocker arm J, depending fromandrigidly secured to a rock I i shaft J, from which movement is impartedv "to the swinging needle bar gate or frame 2,

in the manner hereinafter described. f K represents, a bar or link having at its frontend a split head embracing a stud 3, which is adjustable up and down ina curved slot Z, to varythe amount of throw of the rock shaft J. .This bar or link K has a 1on gitudinal slot for the passagelofthe pin y. c

the rear end of said bar or link K is a pin 7, on which is pivoteda frame 8, which has Patented Sept. 1, 1914.;

imparts oscillatory movement to the'rock shaft J. Projecting i downwardly from the ivoted frame 8 is a lug 10, having at its lower enda pin 11, adapted to fit in a curved slot 2'), forined in a plate12, the latter being screwed or otherwise secured to a plate 13, that is pivoted upon a stud 15 secured to the bracket 15' on the machine frame. I

.The two plates 12 and 13 are recessed at 0, so that when thrown upward, they engage the pin j on the arm J, and thus hold the rock shaft from oscillation when the pivoted frame 8 is out of. engagement therewith. The pivoted frame 8 is normally pressed downward by means of a spring 17 seated in the yoke 16 forming apartof the frame 8, and the upper end of said spring bears against the'aunder side of the bar K. The plate 13 is pivoted at 19 to a link 20, the lower end of which is pivoted to a vertical slidable block 21, having on its inner side a projection 22, that cooperates with a projection 23 on the frame G, inorder to prevent movement of the block 21, except when the cam f is in a certain position, this be ing timed so that the cam willonly assume this position as the needle is just. about to enter the goods. 1

As above stated, by adjusting the stud 3 up or down the, curved slot Z, the amount of lateral throwv of the needle is varied. 1n adjusting this, the pivoted frame 8 is also adjusted.

The plates 12 and 13 are mounted on the frame of the machine, and, therefore, re main in proper relationto the pin 7' for alladjustments of the link K, The slot 5 is formed about the'pin j as a center, and in adjusting the link K the pin 11 willmove in the slot Z)" as the link K turns about the pin'j as a center.- The plate 13 has; a forwardly projecting arm (5., that is connected to the lever 25, which is pivoted to a bracket 26 on the machine frame, the lever being in suitable operative connection with atreadle, and being normally elevated by a spring- (see Fig. 8), leaving the plates 12 and13 in engagement with the pivot pin j, so that,

the machine will sew straight-away, but

when the lever 25 is pulled. downward, the,

parts are shifted to cause the pivoted frame 8 to engage the pin j, and thus oscillatory movement will be imparted to the rock shaft J and, therefore, Zig zag movement is attained.

Assuming the parts to be inthe position shown in Fig. 4, the pin j is. locked in the recesses c of plates 12 and -13, so that no swinging of the needle bar gate or frame can take place. frameS is out of engagementv with the y, andthe usual straight-away sewing is c:

complished by the machine.

v The bar K, by reason of the slottherein,

slides back and forward with respect to the.

The pivoted member or pin j, which passes through said slot. To shift to Zig zag sewing, the operator pulls downon the lever 25, moving the same to the position shown in Fig. 6. This tilts the cam plates 12 and 13, moving down the slide block 21, and forcing the pivoted frame 8 into engagement with the pin j. When the frame 8 is locked to the' pin y','the reciprocatory movement of the bar K is transmitted to the frame J, thus oscillatingthe rock shaft J, and through it imparting lateral movement to the needle. It will be understood that the pivoted frame 8, cannot be Eforced entirely into engagement withrthe fpin j until cam 7' has pulled the projection 23 out of line with the projection 22, which happens when the needle is on its descent and about to enter the goods. The width of thezig zag line for stitching may be regulatedby adjusting the bolt or stud 3 in the curved slot Z. In practice, it has been found desirable to use a cam f of the shape shown. This three-cornered cam gives the necessary time for thechange from one style of stitch- ,ing to the other, as the fork is at rest be-.. tween the points on the cam ,marked with stars. All the switching of the mechanism takes place while the cam moves from one 'star to the other.

7 On the front of the arm A are arranged two tension members 29 and 30, each comrisin a )airof disks havin flared 'ed es i b a i and arranged to receive the thread, the latter passing between both sets of disks, and jtheretarding effect of both tension members being exercised thereon during the; straight-away stitching operation. During the formation ofzig zag stitches, however, less tension is required, and provision is made for automatically, releasing the tension 30. For this purpose, awedge plate 31 is adjustably secured tothe upper end of an arm 32 that passes through a suitable guide block secured to the arm A. The lower end of-the arm 32 is pivotally connectedto the lever 25, so that when the lever is operated for the purpose of changing the mechanism for the production of zig zag stitches, the wedge plate will be forced between the disks constituting the tension member 30, and the thread will no longer be retarded as it passes through said disks. When changing to straightaway stitching, the wedging member is withdrawn, and the tension members act inthe usual manner. Y j

j The swinging gate '2, which carries the needlebar' is of a type common to a well known Union special overseaming machine, the rear portion of the gate being provided with anyarm 35, that is connected byia link .36 to the rocker arm 37, on the-forward end of the'rock shaft J,:as shownin Fig. l.

transmitting motion thereto; these latter portions being arranged, as usual, below the cloth plate E. In connection with this mechanism is employed a movable loop detainer for detaining the loopof the needle thread on the looper and holding it back out of the way, as clearly set forth vin Let ters Patent of the United States, granted to Russel G. Woodward, on July 12th, 1904:, No. 765,120. Referring particularly to this mechanism, 60 designates'a cam or eccentric carried by the mainshaft B, and embraced by an eccentric strap 61, from which extends a rod 62 which is connected atits outer end to the arm 68, of a bell "crank I lever, of which the central portion forms a sleeve, and is pivoted on astud-G, supported on the bed of the machine. The other arm 65 of the bell crank lever is connected to one end of a sliding and rock shaft 66, adapted to suitable bearings formed in lugs 67 on the standards 68,secured to the bed of the machine, a sliding movement of the shaft being transmitted to it from the main shaft B through the bell crank lever and connections described.

ings thereof, is the lowerendof aloop detainer carrying frame 70, to the top of which is adjustably secured a head 71, the

latter being provided with a horizontal gframe is an arm 95, that projects over the second set of rollers 89, and is provided with -a wear plate 96, for engagement with said i rollers, the wear plate-sliding to and fro ;over therollers, as indicated by the movefment of the rocker frame 81. portion of the arm 95, carries a laterally adjustable block 98, which has a vertical slot for the reception ofthe vertically ad- ,justable shank 99 of the upper feed dog 82, the vertical position of the dog being adjusted by a set screw 100, and the lock inut 101, and a set screw-102 being employed to hold said dog in any position to which it may be adjusted. The upper arm 95 is held down in engagement with the rollers 89, by, means of a leaf spring 103, the rear socket for the reception of the end of a loop detainer 72 said 1003 detainer havin a beak 73, that extends towardthefront of the machine. The body portion of the frame is recessed for'the reception of an actuating cam 75 thatis secured to the main shaft B,so that as the shaft is rotated'the loop detainer carrying frame will be rocked with the shaft 66 as a center, and will be slid to and fro as the shaft 66 receives -motion from the bell. crank lever 63. The

ment, reverse of the first movement, and.

finally an oscillating movement the reverse of the second movement ;the movements being properly timed withrespect to the movement of the looper, so that the loops of the needle threadentered by the looper will be held back 'on the looper, or forced back thereof by the. detainer until. such time as the needlepoint on its next descent has passed below the point of thelooper,

own thread is avoided 1 The construction of the looper and its and all danger ofthe needle cutting off its rockingframe as well as the construction and operation of'the take-up parts is practically the same asset forth in the Letters Patent No. 765,120,- hereinbefore referred to, and the method of operation of the take up, the looper and the loopdetainer is the same as described in said Letters Patent.

The lowerfeed dog 'is supported and receives motion from the rocker arm 81,

in the usual manner. The present machine, however, ncludes a top feed dog 82, which receives motion partly from the feed rocker 81, and partly-from the cam 75, which oscil- J 'lates the loop detainer.

Mounted on the lower pivotpin 84: of the'rocker frame is an arm 85, "that ex :tends toward the front ofthe machine and has an upturned end portion 86, that is Pivoted to the upper pin 9450f the rocker The upper end of which; is secured to the rear face of the vfeed rocker frame 81, while the forward free end of the spring bears against the top of the ar1n95. a I

The upper feed dog is approximately U- shaped in form, in order that it may be curved around the rear of the presser foot H, and secured to the lower portion of the presser bar a hook-shaped arm 106, the lower end of which is bent forward under fthe'rear end of the top feed dog, so that ;when the presserfoot is elevated the top 'feed'dog will also be raised in order tofr'ee the ,work. This upward movement of the split to form a plurality of parallel plates 87, these plates being provided with open- ,ings for the rece'ptionof two sets of'anti- Efriction rollers 88 and89. The plates are, icurved forward; to extend partly cover the ,cam or eccentric 7 5, and the rollers 88 bear against the upper rear portionof said eccentri c, sothat as the latter rotates'the arm will receive a rocking movement with the axis of the shaft or spindle 8 f as a ;center. The upward movement of the arm ;is resisted by a spring 90, that extends be- Etween the upper face of the arm 85, and the Eoverhanging portion of a bracket 91, the base of which is secured to the bedplate.

top feed dog is resisted by the spring 103, which normally holds the arm '95, down against the rollers 89.

It will beseen that the feed dogs while receiving horizontal movement from the same rocker, are independently operated, so far as vertical movement is concerned, and that the operating mechanism of the upper dog is such as to permit the ready raising and lowering of such dog with the presser foot.

Having thus described my invention, what 1 claim as new and desire to secure by Letters Patent, is

1. The combination with a work support, of a feeding mechanism comprising a feed bar, a feed dog carried thereby and overhanging the work support, means for reciprocating said bar horizontally, and means for raising and lowering said feed bar, in-

cluding a pivoted arm, an eccentric engaging the free end of said arm, and means carried by the freeendof said arm for engaging said feed bar; substantially as described.

2. The combination with a work support, of a feeding mechanism comprising a feed bar, a feed dog carried thereby and overhanging the work support, means for reciprocating said bar horizontally, and means for raising and lowering said feed bar, including a pivoted arm, an eccentric engaging the free end of said arm, means carried by the free end of said arm for en gaging said feed bar, and a spring for holding said feed bar in engagement with said arm; substantially as described.

3. The combination with a work support, of afeeding mechanism, a feed dog overhanging the work support and acting on the upper surface of the material, an eccentric and means to operate it, an arm in engagement with said eccentric and pivoted to a stationary center, a second arm pivoted to a moving center, means to swing said center, means carried by said first named arm for engaging and lifting said second arm and means to hold said arms in engagementwith one another; substantially as described.

4. A sewing machine including in combination, a needle, a feed dog overhanging the work support, and acting upon the material, an eccentric, means for operating the eccentric, an arm engaging said eccentric for imparting vertical movement to the feed dog, said arm being pivoted to swing up and down about a fixed center, a rocking frame, a second arm pivoted to said rocking frame, and adapted to be moved up and down by the first-named arm, said feed dog: being carried by said second arm, the pivotal connection between the arm and said rocking frame being over the pivotal connection of the first arm, said pivotal. connections being on the same side of the needle, substantially as described.

5. In a feeding mechanism, a feed dog acting on the material, an eccentric, an arm in engagement with said eccentric and pivoted to a stationary center, means to hold said arm in engagement with said eccentric,

a second arm having vertical motion imparted to it from the first arm and being pivoted to a moving center, and means mov-' ing bodily with said second arm to hold it in engagement with the first arm; substantially as described.

6. In a sewing machine, a feed dog, means for operating the same, a second feed dog, a

feed bar supporting said second feed dog,

for operating the same,,asecond feed dog, a

feedbar supporting said second feed dog,

means for reciprocating said feed bar horizontally, and means for raising and lowering said feed bar, including aneccentric,

and devices intermediate said eccentric and feed bar, on which said feed bar freely rests, whereby said feed bar may be raised from said devices, and a spring for holding said feed bar in contact with said devices; substantially as described.

S. The combination with a work support I a a of feeding mechanism lncluding a feed dog overhanging said work support and engaging the upper surface of the material, a feed bar, an eccentric, a device intermediate said eccentric and said feed bar on which said feed bar freely rests, whereby said feed bar may be raised from said device, and means for reciprocating said feed bar.

9. The combination with a work support, of feeding mechanism including a feed dog overhanging said work support and enga ing the upper surface of the material, a feed bar, an eccentric, a device intermediate said eccentric and said feed bar on which said feed bar freely rests, whereby said feed bar may be raised from said device, means for reciprocating said feed bar, means for holding said feed bar in contact with said device, and means for raising said feed bar.

10. A feeding mechanism having a feed bar, a feed dog carried thereby, means for reciprocating said feed bar, and means for raising and lowering the same including an eccentric, a pivoted arm, a roller carried by the free end of said arm and engaging said eccentric, and a second roller carried by the free end of said arm on which said feed bar rests; substantially as described.

- 11'. a A feeding mechanism having afeed bar,

centric, a pivotedarm, a roller carried by the free end of said arm and engaging said eccentric, and a second roller'carried by the free end of said arm on which said feed bar rests, a spring moving with said feedbar and holding the same in contact with said; roller; substantially as described. a

12. In a machine of the class described, the co-mbinationwith the lower feed dog, of

a presser foot, an upper feed dog partly encirclmg the rear of thefpresser-foot, and a hooked arm depending from the presser bar and arranged to engage with therear por-' tion of the top feed dog; substantially asdescribed.

13. In asewing machine, ,a work support. a top feed dog overhangmg said work sup arm arranged to reciprocate inan approXi-' mately horizontal plane, said arm resting upon and being movable independently of said member and means for raising said feed dog from said movable member; substantially as described.

15. In a sewing machine, a work support a top feed dog overhanging said work support, a pivotally mounted arm arranged for oscillatory movement in a vertical plane, a cam for operating said arm, a rocking frame, and a feed dog carrying arm pivoted to said frame and resting on said pivotally mounted arm; substantially as described.

16. In a sewing machine, a top feed dog, a pivotally mounted arm arranged for oscillatory movement in a vertical plane, and having an upwardly extending portion at its free end, rollers journaled in the upper portion of the arm, a cam acting on one of said rollers to impart movement to the arm, a rocking frame, and a feed dog carrying arm pivoted to said frame and resting on said rollers; substantially as described.

17. In a sewing machine, a work support a top feed dog overhanging the work support, and engaging the upper surface of the material, a rocking frame, a feed dog carrying arm having one end pivoted thereto, a vertically movable member on' which the free end of the arm rests, and a spring for holding the arm down in engagement with said member; substantially as described.

tory movement in a vertical plane, and havmg an upwardly extending portion at its free'end, a plurality ofrollers'journaled in the upper portion of the arm, a cam acting on oneof said rollers topactuate the arm, a rocking frame, a feed dog carrying arm having one end pivoted to the frame and providedat its free end with a wear plate resting on one of said rollers, and a spring secured to the rocking frame and bearing on said dog carrying arm; substantially as described; c

'19. In a machine of the class described, the

18.- In a sewing machine, atop feedJ-d0g,.a pivotally mounted arm arranged for oscillacombination withstitch-forming mechanism,

including a loop. detainer, of. an operating cam; therefor, a lower. feed dog, a pr'esser foot, and a topfeed dog receiving vertical motion fromthe actuating cam of the ,loop

.detainer and means for reciprocating said top feed dog;substantially as described.

20. In a machine of the class described, the combination with themain shaft, of a cam thereon, a bottom feed dog, a feed dog rocker frame connected thereto, a top feed dog, an arm pivoted at the upper portion of the rocker frame and connected to said top feed dog, a second pivoted arm arranged under the first arm and provided at its forward end with a plurality of anti-friction rollers with one of which the upper arm engages, and a cam mounted on the main shaft and engaging a second anti-friction roller; substantially as described.

21.In a machine of the class described, the combination with a main shaft of a cam thereon, a feed rocker frame, a pivoted arm extending transversely with respect to the machine and having an upbent forward end a plurality of anti-friction rollers carried by the end of said arm, one of said rollers being arrangedto be engaged by the cam, a spring tending to depress said arm, an upper arm pivoted to the feed rocker frame, a wear plate carried by the upper arm and resting against the second anti-friction roller, an adjustable block carried by the upper arm, and a top feed dog adjustably secured to said block; substantia ly as described.

22. In a sewing machine, a feed dog, a feed bar carrying said feed dog, a rocking frame to which said feed bar is pivoted, means for vibrating said rocking frame for moving said feed dog back and forth, a second feed dog, a feed bar carrying said second feed dog, said second feed bar being pivoted to said rocking frame, aneccentric for raising and lowering said second feed bar, a pivotedarm on the free end of which said second feed bar rests, said arm engaging said eccentric whereby said arm is moved up and down.

23. In a sewing machine, a feed dog, a feedbar carrying said feed dog, a rocking frame to which said feed bar is plvoted, means for dog, a feed ar carrying said second feed dog, said second feed bar being pivoted to said rocking frame, an eccentric for raising and lowering said second feed bar, a pivoted arm on the free end of which said second feed bar rests, .said arm engaging said eccentric whereby said varm is moved up and down, a spring for holding said arm in contact with said eccentric and a second spring for holdingsaid second feed bar in contact with said arm.

24. In a sewing machine, a feed dog, a feed bar carrying said feed dog, a rocking frame to which said feed bar is pivoted, means for vibrating said rocking frame for moving said feed dog back and forth, a second feed dog, a feed bar carrying said second feed dog, said second feed bar being 20 pivoted to said rocking frame, an eccentric for raising and lowering said second feed bar, a pivoted arm on the free end of which said second feed bar rests, said arm engaging said eccentric, whereby said arm is 25 Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents 1 Washington, D. 0. 

